Bump System.Text.Json to 9.0.8

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-version: 9.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: System.Text.Json
  dependency-version: 9.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Microsoft.OpenApi.YamlReader/Microsoft.OpenApi.YamlReader.csproj

@@ -34,7 +34,7 @@
         </PackageReference>
 
         <PackageReference Include="SharpYaml" Version="2.1.3" />
-        <PackageReference Include="System.Text.Json" Version="[8.0.5,)" />
+        <PackageReference Include="System.Text.Json" Version="9.0.8" />
         <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-hh2w-p6rv-4g7w" />
         <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-8g4q-xg66-9fp4" />
     </ItemGroup>

src/Microsoft.OpenApi/Microsoft.OpenApi.csproj

@@ -24,7 +24,7 @@
         <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
     </PropertyGroup>
     <ItemGroup>        
-        <PackageReference Include="System.Text.Json" Version="[8.0.5,)" />
+        <PackageReference Include="System.Text.Json" Version="9.0.8" />
         <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-hh2w-p6rv-4g7w" />
         <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-8g4q-xg66-9fp4" />
     </ItemGroup>